Erlangen 2018 – scientific programme

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A: Fachverband Atomphysik

A 31: Strong laser fields - II

A 31.6: Talk

Wednesday, March 7, 2018, 15:30–15:45, K 2.019

CEP-asymmetries from bichromatic multi-photon ionization of Xenon atoms — •Stefanie Kerbstadt, Dominik Pengel, Lars Englert, Tim-Daniel Bayer, and Matthias Wollenhaupt — Carl von Ossietzky Universität Oldenburg, Institut für Physik, Carl-von-Ossietzky-Straße 9-11, 26129 Oldenburg

Recently, we introduced a novel approach to the generation of polarization-tailored bichromatic fields, based on ultrafast pulse shaping of an octave-spanning Carrier Envelope Phase (CEP)-stable white light supercontinuum [1-2]. The bichromatic shaping scheme opens up an entirely new class of polarization-tailored optical waveforms for various applications including multi-pathway coherent control of ultrafast dynamics, high-order harmonics generation and the design of polarization-sensitive two-color pump-probe experiments with phase-locked CEP-stable laser pulses at a broad range of excitation wavelengths [3]. In this contribution, bichromatic pulse shaping is applied to study CEP-sensitive lateral asymmetries in the photoelectron angular distribution from 7- vs. 8-photon ionization of Xenon atoms. The physical mechanism is discussed in terms of the interference of states with opposite parity, addressed by the corresponding quantum pathways. In addition, we vary the polarization state of both colors from linear to circular, generating a CEP-sensitive 3D-photoelectron wave packets with 1-arm-vortex shape.

[1] S. Kerbstadt et al., J. Mod. Opt. 64 (2017) 1010.

[2] S. Kerbstadt et al., Opt. Expr. 25 (2017) 12518.

[3] S. Kerbstadt et al., New J. Phys. 19 (2017) 103017.